Review: Integers, Eq's/Ineq's, WPs..

A submarine is diving at a constant rate toward the ocean floor. The equation y = -50x - 250 can be used to represent this situation, where y is the depth of the submarine in meters below sea level and x is the number of seconds the submarine is traveling.

• From a starting position of 50 meters below sea level, the submarine is descending 250 meters per second.

• From a starting position of 250 meters below sea level, the submarine is descending 50 meters per second.

• From a starting position of 50 meters below sea level, the submarine is ascending 250 meters per second.

• From a starting position of 250 meters below sea level, the submarine is ascending 50 meters per second.

An airplane takes off from its airport, and travels upward at a constant rate of change. The equation y = 1000x + 580 can be used to represent this situation, where y is the altitude level the plane has reached after x seconds.

• From a starting position of 580 meters below sea level, the airplane is ascending 1000 meters per second.

• From a starting position of 1000 meters below sea level, the airplane is ascending 580 meters per second.

• From a starting position of 1000 meters above sea level, the airplane is descending 580 meters per second.

• From a starting position of 580 meters above sea level, the airplane is ascending 1000 meters per second.

Tom's father gave him a collection of baseball cards. Tom was given 9 packages with a dozen cards each. Tom plans to collect 5 new cards per week.

Which equation below best describes the number of weeks (w) needed for Tom to have a collection greater than 450 baseball cards?

• y < 450w - 5

• 450 < 5x + 108

• 450 > 5w - 108

• 108 = 5w + 450

Which situation can be represented by this inequality?

150 > 15k + 52

• Jon has 15 stamps in his collection. He will collect 52 every year. He collects stamps for k years. For what values of k will Jon have at least 150?

• Jon has 52 stamps in his collection. He will collect 15 every year. He collects stamps for k years. For what values of k will Jon have at least 150?

• Jon has 15 stamps in his collection. He will collect 52 every year. He collects stamps for k years. For what values of k will Jon have at most 150?

• Jon has 52 stamps in his collection. He will collect 15 every year. He collects stamps for k years. For what values of k will Jon have at most 150?

-11 + 67 = x

What does x equal?

• 56

• -56

• 78

• -78

A store sells new video games for $45 each. Used video games sell for $14 each. Jack is buying 3 new video games and x used video games. Which equation can be used to find y, the total price Jack must pay in dollars?

• y = 14x + 135

• y = 14x + 45

• y = 135x + 14

• y = 45x + 14

Which equation is true when x = -15?

• 3x – 11 = -34

• 𝑥 /3 + 17 = 12

• 𝑥 /5 + 2.5 = 0.5

• ̶ 53 + 4x = 7

What is the solution to the equation?

3x + 11 = 47

• x = 19.33

• x = 15.66

• x = 12

• x = 36

What is the solution to the equation?

5x + 12 = 47

• x = 35

• x = 11.8

• x = -11.8

• x = 7

• x = 5

Which equation is true when x = -11?

• 2x – 5 = 22

• 3x – 5 = -28

• 4x – 5 = -49

• 5x – 5 = 50